Spring to actuator bearing mechanism
A plastic actuator for a toggle switch has a metal rod embedded therein, with the metal surface partially exposed. This surface of the metal rod functions as a bearing surface for a positioning spring as the actuator is flipped back and forth to turn the switch on and off. The use of the metal rod to provide a bearing surface in the toggle actuator substantially reduces wear on the actuator, and thus permits the actuator to be made out of a thermoplastic material rather than a thermoset material, thereby effecting a cost savings.
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This application claims the benefit of the filing date of a provisional application having application Ser. No. 60/696,469, which was filed on Jul. 1, 2005.
FIELD OF THE INVENTIONThis invention relates to electrical switching devices, and more particularly a toggle actuator in a toggle switch.
BACKGROUND OF THE INVENTIONToggle switches for electrical devices are well known. The actuator portion of a toggle switch is typically made of plastic, and is subject to wear every time the switch is thrown.
As shown in
An extension 52 extends from the bottom of actuator 15; the bottom end of extension 52 receives thereabout a positioning spring 56, the other end of which is positioned in a recess 54 in bottom wall 42. Extension 52, recess 54 and spring 56 provide an over-center retaining mechanism to retain toggle lever 16 in each of two distinct positions.
Extension 52 is generally formed integrally with actuator 15, and is constantly in contact with spring 56. In order to prevent rapid wear of the extension at the bearing surface (that is, where the extension contacts the spring), the entire actuator is typically made of a durable nonconducting material (e.g. thermosetting plastic). There is a need for a toggle switch actuator that can be produced at lower cost while still being resistant to wear at the bearing surfaces.
SUMMARY OF THE INVENTIONThe present invention addresses the above-described need by providing a toggle switch including an actuator and a coil spring. The actuator, which is rotatably mounted in a switch body, includes an actuator body portion and a bearing surface portion; the actuator body portion and the bearing surface portion are of different materials. The coil spring has a first end and a second end; the first end surrounds an end portion of the actuator body portion while making contact with the actuator only at the bearing surface portion. The second end is positioned in a recess formed in the switch body. The end portion and the spring form a retaining mechanism for the actuator. Rotation of the actuator (such as movement of the toggle lever between the ON and OFF positions) causes the bearing surface portion to pivot relative to the spring.
In a particular embodiment of the invention, a plastic actuator for a toggle switch has a metal rod which is embedded in the actuator, with the metal surface of the rod partially exposed. This metal surface functions as a bearing surface for a positioning spring as the actuator is flipped back and forth to turn the switch on and off. The use of the metal rod as a bearing surface in the toggle actuator substantially reduces wear on the actuator, and thus permits the actuator to be made out of a thermoplastic material rather than a thermoset material, thereby effecting a cost savings.
The foregoing has outlined, rather broadly, the preferred feature of the present invention so that those skilled in the art may better understand the detailed description of the invention that follows. Additional features of the invention will be described hereinafter that form the subject of the claims of the invention. Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiment as a basis for designing or modifying other structures for carrying out the same purposes of the present invention and that such other structures do not depart from the spirit and scope of the invention in its broadest form.
Other aspects, features, and advantages of the present invention will become more fully apparent from the following detailed description, the appended claims, and the accompanying drawings in which similar elements are given similar reference numerals:
While the invention has been shown and described in terms of specific embodiments, it is evident in view of the foregoing description that numerous alternatives, modifications and variations of the form and details of the invention and in its operation may be made by those skilled in the art, without departing from the spirit of the invention. Accordingly, the invention is intended to encompass all such alternatives, modifications and variations which fall within the scope and spirit of the invention and the following claims.
Claims
1. A toggle switch comprising:
- a coil spring disposed in a switch body; and
- an actuator rotatably mounted in the switch body, said actuator including
- an actuator body and
- a bearing surface comprising a metal rod embedded in said actuator body and having a partially exposed surface, wherein
- the actuator makes contact with the spring only at the bearing surface,
- the bearing surface is continuously in contact with the spring, and
- the actuator body and the bearing surface are of different materials.
2. A toggle switch according to claim 1, wherein said spring makes contact with the bearing surface at two locations on an end coil thereof.
3. A toggle switch according to claim 2, wherein rotation of the actuator causes the bearing surface to pivot relative to said spring.
4. A toggle switch according to claim 2, wherein the actuator body portion includes an end and the spring surrounds the end.
5. A toggle switch according to claim 4, wherein the spring has a first end and a second end, the first end including the end coil making contact with the bearing surface and the second end making contact with the switch body, the actuator body end and the spring forming a retaining mechanism for the actuator.
6. A toggle switch according to claim 4, wherein the actuator body is of thermoplastic material.
7. A toggle switch comprising:
- an actuator rotatably mounted in a switch body, said actuator including an actuator body and a bearing surface, the actuator body and the bearing surface being of different materials; and
- a coil spring having a first end and a second end, the first end surrounding an end of the actuator body and making contact with the actuator only at the bearing surface, the second end making contact with the switch body, the end and the spring forming a retaining mechanism for the actuator, wherein
- the bearing surface is a metal rod embedded in the actuator body and having a partially exposed surface for making contact with the spring, and
- the bearing surface is continuously in contact with the spring.
8. A toggle switch according to claim 7, wherein the actuator body is of thermoplastic material.
9. A toggle switch according to claim 7, wherein rotation of the actuator causes the bearing surface to pivot relative to the spring.
10. A toggle switch comprising:
- a body member having a front wall and a back wall spaced apart and substantially parallel to said front wall, a first end wall and a second end wall spaced apart and substantially parallel to said first end wall and a bottom wall, said front wall, said back wall, and said first end wall and said second end wall joined to said bottom wall to form a rectangular body member open at the top and with a central cavity therein;
- a toggle actuator of plastic rotatably mounted upon said front wall and said back wall, within said central cavity, said toggle actuator including a toggle lever;
- a stationary contact mounted to said body member;
- a movable contact mounted to said body member and engageable by said toggle actuator to move into contact away from contact with said stationary contact in accordance with movement of the toggle lever;
- a coil spring positioned to engage the lower end of said toggle actuator; and
- a metal rod embedded in the lower end of said toggle actuator and positioned to contact said coil spring, wherein
- said metal rod forms a bearing surface with said coil spring,
- the toggle actuator is in contact with the spring only at the bearing surface, and
- the bearing surface is continuously in contact with the spring.
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Type: Grant
Filed: Jun 30, 2006
Date of Patent: Mar 4, 2008
Patent Publication Number: 20070158169
Assignee: Leviton Manufacturing Co., Inc. (Little Neck, NY)
Inventor: George Timothy Shatley (Crumpler, NC)
Primary Examiner: Michael Friedhofer
Attorney: Paul J. Sutton
Application Number: 11/428,274
International Classification: H01H 21/24 (20060101);